Roll for sugar-cane and like mills



April 24, 1928. 1,667,632

W. MACKIE ROLL FOR` SUGAR CANE AND LIKE MILLS Filed Jan. 25. 1924 2 Sh'eets-Sheet 1 i umm nu E April 24, 1928. 1,667,632

W. MACKIE ROLL FOR SUGAR CNE AND LIKE MILLS Filed Jan. 2.5. 1924 2 Sheets-Sheet 2 F/c. F/ 6.7. .B2 32 A /m/E/v rfb/s- IA//M uw /VAf/f/fj by /7/s Afro/'nys Patented Apr. 24, 1928.

UNITED-STATE 1,667,632 FICE.

WILLIAM MACKIE, or ciLAscioW,` SCOTLAND.

ROLL FOR SUGAR-CANE AND LIKE MILLS. i

Application lled January 25, 1924, Serial No. 688,535, and in Great Britain October 18, 192.8.l

The invention relates to sugar-caneand like mill-rolls of the type having intermeshing circumferential or helical surface grooves, and has for its object an improved formand contour of grooving applicable (it maybe in varying pitches and proportions) throughout the mill and also-and more particularly--to pairs of preliminary crushing rolls of which there may be any'convenient number.

In a roll according to the invention there is a primary series of grooves the 'sectional contour of which is triangular-the Hanks lying at equal and opposite angles to planes of rotation bisecting them. Upon the flanks of these triangular grooves there are formed any convenient number of secondary grooves (and corresponding counterpart projections). These secondary grooves areA in contour similar to the primary grooves-that is to say, they are preferably equi-angular,-

alternatively however, they may be of unequal angles-for instance one surface may be peripheral.

The points of the projections and the roots of eitheror both primary and secondarygrooves may be iattened or rounded. Both primary and secondary grooves constitute a series of acute-angled circular wedges, the former of the full diameter of the roll, the latter of less than the full diameter of the roll.

A roll made according to the invention thus gives greater gripping capacity, more crushing surface and moie channels for the outlet of juice than is obtained when the flanks rof the primary grooves are left plain as usual.

Several examples of the invention are shown diagrammatically on two accompanying sheets of explanatory drawings in which Figure l is a front elevation, Figure 2 a cross sectional view of one roll and Figure 3, sheet 2, a part view in front elevation to an enlarged scale of the first example. Figures 4 and 5, are part views in front elevation and Figures 6 and 7, part views in cross-sectional elevation of four further eX- aniples. Y f

In the examples shown in Figures l, 2 and 3, each roll has Vusual helical grooves A, and according to the invention, the usual circumferential grooves A1 which are of triangular section and have lianks A2 lying at equal and opposite angles to planes of rotation (shown in chain lines in Figure 2) l projection A4 have formed lin them ay series ofy secondary grooves Aa and counterpart projections A* these grooves and project-ions also having vHanks:e'quiangular to planes of rotation.

The example shown in Figure 4 vdiffers 1 f romthe first example only in that two seriesrof secondary grooves A3 and counterpart projections Atare formed in the flanksy of the primary circumferential grooves A1.

In the example shown in Figure 5 the secondary grooves A3 and the counterpart have each one Hank B peripheral. The second flanks B1 of the groove and of the projection are inclined to the shredding sugar cane, fed side-on or end-on,

co-operating horizontal rolls each having a crushing surface constituted byY a series of equi-spaced acute-angled circular wedges each of the full diameter ofthe roll-and each having two flanks equally and oppositely inclined to the plane of rotation and each of the same depth, and intermediate said wedges circular wedges each of less than the full diameter of the roll and each having two flanks equally and oppositely inclined to the plane of rotation, at the same inclination to said plane as the Hanks of said first named wedges, adjacent wedges presenting between them V-shaped differently lspaced from the axis of tie roll, a plane of rotation equispac-ed from the apexes of twoadjacent wedges of the full diameter of the roll containing the bottom of the groove between two intermediate tom defining acute-angled imaginary wedgesurfaces having equally inclined flanks, the apexes of said intermediate wedges projecting beyond said imaginary surfaces and the bottoms of the grooves between said first named wedge and said intermediate Wedges being nearer the axis of the roll than said `plane of rotation as in the previous eX- ivedges, the said apeXes and said groove bot- 

